Ключевые слова: business travelers, cleaning service, communication, do not disturb, door hanger, door status, guest comfort, guest needs, guest room, guest services, hospitality industry, hotel etiquette, hotel policy, hotel protocol, hotel sign, housekeeping, no entry, notification message, occupancy indicator, politeness, privacy please, privacy sign, quiet time, relax mode, room occupied, room service, room status, room status sign, service industry, signboard, sleep sign, staff efficiency, staff guidelines, staff notification, visitors,